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scoundrel [369]
3 years ago
15

Estimate the average force that a baseball pitcher's hand exerts on a 0.145-kg baseball as he throws a 39-m/s pitch. Assume the

pitcher accelerates the ball through a horizontal distance of 2.0 m, from behind his body to where the ball is released and ignore the air resistance.
Physics
1 answer:
Misha Larkins [42]3 years ago
4 0

Answer:

55 N

Explanation:

Assuming no potential energy changes.

The work applied increases the kinetic energy.

Fd = ½mv²

F = mv²/2d = 0.145(39²) / (2(2.0)) = 55.13625 ≈ 55 N

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At what altitude h above the north pole is the weight of an object reduced to 67% of its earth-surface value? Assume a spherical
lara31 [8.8K]

Answer:

The answer to the question is

At an altitude of 1413 km or 1.222·R above the north pole the weight of an object reduced to 67% of its earth-surface value

Explanation:

We make use of the gravitational formula as follows

F = G\frac{m_{1} m_{2} }{R^{2} }  where

m₁ = mass of the object

m₂ = mass of the earth

d = distance between the two objects and

G = gravitational constant

if at the altitude the weight is reduced to 67 % of its weight on earth then

with all other variables remaining constant, we have

67% F = G\frac{m_{1} m_{2} }{R_{2} ^{2} } =0.67× G×\frac{m_{1} m_{2} }{R_{1} ^{2} }

cancelleing like ternss from  both sides we have

1/R₂² =0.67/R₁² or r₁²/R₂² =0.67 and R₁/R₂ = 0.8185

or R₂ = R₁/0.8185 or 1.222·R = (6.37×10⁶ m)/0.8185 = 7.783×10⁶ m

Hence at an altitude = 1.413×10⁶ m the weight of the object will reduce to 67% its earth-surface value

6 0
3 years ago
Which statement is true regarding the circuit schematic below?
asambeis [7]

C. This is a direct current

<h3></h3><h3>What is schematic Current?</h3>

An electrical schematic is a diagram that shows how all of the wires and components in an electronic circuit are connected.

The ability to read electrical schematics is a really useful skill to have. To start developing your schematic reading abilities,

it’s important to memorize the most common schematic symbols.

Each physical component (i.e resistor, capacitor, transistor) has a unique schematic symbol.

Learn more about Schematic current:

brainly.com/question/15193719

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4 0
2 years ago
23. The force required to accelerate a 2.0-kilogram
Marianna [84]
Answer:
C) 8.0 N

Explanation:
F=m*a
4 0
3 years ago
3. When a species changes over time
elena55 [62]

Answer:

It has adapted to its environment/surroundings. The adaptation aids in the organism's survival.

3 0
3 years ago
Forgot how to do this please help
maksim [4K]
1) -76.27
2)-119.47
3)-256.27
4)-87.07
Here’s the formula for the last one so you know how to do it. Hope this helps!!!

3 0
3 years ago
Read 2 more answers
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